Apple Reminders and Calendar: how the link actually works

For most of the past decade, Reminders and Calendar on a Mac were two apps that shared an account and nothing else. A to-do with a due date at 15:00 lived in one window, the meeting at 15:00 lived in another, and the only place they met was in someone's head. That changed, quietly, and the change is switched off by default. Which is why plenty of people running a current version of macOS still keep both windows open.

The connection now exists, it is a single checkbox, and it comes with four rules that determine whether it is useful or merely present. Those rules are the interesting part, because they explain every complaint that follows the initial setup: the reminder that never appeared, the repeating task that shows one instance instead of twelve, and the account where none of it works.

The link is one checkbox in the calendar list

Open the calendar list on the left of the Calendar window. If it is hidden, View then Show Calendar List brings it back. Below the account calendars there is an entry named Scheduled Reminders with a checkbox beside it.

Ticking it draws reminders into the grid. Apple describes the placement precisely:

Reminders scheduled as all day appear in the all-day section at the top of the calendar. Reminders with a time appear next to a specific time in the full-day schedule. Source: support.apple.com

Two details in that sentence do real work. Only reminders that are scheduled appear at all. A reminder with no date is invisible to the calendar, permanently, no matter how urgent it is. That is correct behaviour for a calendar and disappointing for anyone who expected the backlog to show up. The second detail is that timed reminders sit in the schedule itself rather than in a separate column, so they compete for the same visual space as meetings, which is the entire point.

Unticking the box removes them again. Nothing is deleted and nothing changes in the Reminders app, which makes this a safe thing to try for a week and reverse.

The feature is listed in Apple's guide for macOS Sequoia 15 and macOS Tahoe 26. On older versions the checkbox is not there, and no setting will produce it. Anyone on Ventura or Monterey looking for it is looking for something that does not exist on that system.

Repeating reminders show one instance, on purpose

This is the behaviour that generates the most confusion, and it is documented rather than accidental.

A repeating reminder does not fill the calendar with future occurrences the way a repeating event does. Apple's example is a reminder set for every Saturday at 09:00: the following Saturday's instance only appears once the current Saturday's instance has been marked complete. In the calendar, future instances are dimmed, and marking one complete requires the most recent one to be completed first.

The reasoning is consistent with what a task is. A meeting on the third Saturday happens whether or not the second Saturday's meeting happened. A recurring task usually does not, because the point of the recurrence is the streak. Showing twelve future instances of something that has been skipped four times would be a lie about the state of the work.

The practical consequence is that a repeating reminder is a poor way to reserve future time. A weekly review that needs an hour blocked out every Friday should be a calendar event, because an event holds the slot regardless of what happened last week. A weekly review that needs to be tracked as done or not done should be a reminder. Trying to make one object do both jobs is where the disappointment comes from, and the split is usually obvious once the question is asked in those terms.

There is a related point about deletion. Removing a reminder from inside the calendar sends it to the Recently Deleted list in Reminders, where it stays for 30 days. A right click and Delete in the calendar is therefore recoverable, which is worth knowing before treating the grid as a place to tidy up.

Creating a reminder without leaving the calendar

The link runs in both directions. The plus button in the Calendar toolbar offers New Reminder alongside New Event, so a task noticed while looking at the week does not require an app switch.

The dialog asks for a title, a date next to the reminder field, and optionally a specific time. It also allows notes, tags, a URL, a priority and an image, so the object created here is a full reminder rather than a stripped down version of one.

One setting decides where it lands. A specific Reminders list can be chosen at creation time, and if none is chosen the reminder goes to whichever list is set as the default in the Reminders app. Anyone who has ever lost a reminder created from the calendar has usually found it sitting in a default list that was set years ago and forgotten. Checking that default once, in Reminders settings, prevents the whole class of problem.

Editing works differently depending on the view, which is a small thing that costs time until it is learned. In Week or Month view a reminder opens on a double click or a force click. In Day view a single click opens it. Completing one is a click on the circle beside its name, and completed reminders dim in place rather than disappearing, so the day still reads as a record of what happened.

The same switch on iPhone, in a different place

Anyone who sets this up on a Mac and then wonders why the phone looks unchanged is hunting for a checkbox in a place that has no checkboxes.

On iPhone, the control sits in the Calendars sheet. Tapping Calendars at the bottom of the screen opens the list of calendars for the account, and Scheduled Reminders is an entry in it. Selecting it produces the same result as on the Mac: all day reminders appear in the band at the top, timed reminders appear at their time in the day's schedule. Tapping the same entry again hides them.

Creating a reminder is also available from the phone's calendar. The plus button at the top of the screen offers Reminder alongside Event, with a Date field and an optional Time toggle, and the same rule about the default list applies. Completing a reminder is a tap on the circle beside its name, and the note about repeating reminders is identical: future instances are dimmed until the current one is done.

Two things follow from this being a per device setting rather than an account setting. The first is that turning it on in one place does nothing anywhere else, so a Mac, an iPad and an iPhone each need the switch flipped. The second is that this is useful rather than annoying. A phone calendar checked while walking between meetings benefits from being uncluttered, and a laptop calendar used for planning benefits from seeing everything at once. Running the switch on for the Mac and off for the phone is a defensible setup rather than an incomplete one.

The versions matter here as well. Apple documents the iPhone behaviour for iOS 18 and iOS 26. A device on an older release will not have the entry in the Calendars sheet, and the reminders will stay in their own app until the system is updated.

The account decides how much of this works

Everything above assumes the reminders live in iCloud. Apple states the condition directly:

All Reminders features described in this guide are available when you use updated iCloud reminders. Some features aren't available if you are using accounts from other providers. Source: support.apple.com

"Updated" is a specific state, not a figure of speech. Reminders has a one time upgrade, offered as an Update Reminders button in the app, and accounts that were never upgraded run in a compatibility mode that lacks the newer behaviour. If the button is absent, the upgrade already happened.

Other providers are added through System Settings, Internet Accounts, where each account shows toggles for the services it offers. Apple's rule for reading that screen is useful: if Reminders is not in the list for a given account, the provider does not offer a reminders service at all. That single sentence resolves most of the searching people do about connecting task services to Apple's apps.

Where the reminder lives	Appears in Calendar	Full feature set
iCloud, upgraded	Yes	Yes
iCloud, not upgraded	Yes	Partial
Other provider with a Reminders toggle	Yes	Partial
A provider with no Reminders toggle	Not available	Not available

The row that matters is the last one. A task service that does not appear in Internet Accounts cannot be reached through this route, and the answer is either its own app or a calendar client that connects to it separately. Which clients do that, and at what price, is set out in Compared with other calendars.

What the link still does not do

Being visible in the grid is not the same as being protected in it.

A scheduled reminder is not free or busy information. Colleagues checking availability, scheduling links, and shared free and busy views all treat that time as open, because the object is a task in a task list rather than an event on a calendar. Anyone relying on reminders to defend focus time is relying on something invisible to everyone else.

There is no travel time on a reminder either. That field belongs to events, and the difference is easy to miss when both objects sit in the same column. The mechanics of reserving the trip before an appointment are a separate topic, covered in Travel time.

Duration is the third gap. A reminder has a moment, not a length. A two hour task and a two minute task occupy the same sliver of the schedule, which makes the day look emptier than it is. The workaround people arrive at independently is to keep short obligations as reminders and convert anything with real duration into an event, which is less a workaround than a description of what the two objects are for.

Sharing is the fourth, and it behaves in a way that surprises teams. Reminder lists can be shared and assigned, but a shared reminder does not appear on anyone else's calendar unless that person has also turned on the checkbox in their own calendar app. Visibility is a per person, per device decision, so a task assigned on Monday can sit unnoticed in a colleague's task list all week while both people believe the calendar is doing the work.

None of this is an argument against turning the feature on. It is an argument for knowing which of the four gaps applies to a given piece of work before relying on the grid to protect it. Tasks that only need to be remembered are well served. Tasks that need an hour defended against other people are not, and the object for that has always been an event.

What to change first

Turn on Scheduled Reminders, then spend a week noticing which items in the grid are actually tasks and which are blocks of work wearing a task's clothes. Convert the second group into events with real durations, and check the default list in Reminders settings while there. If the friction that remains is getting things into the calendar quickly rather than seeing them once they are in, that is a different problem, and Caltimate is built for it.